How to use the meta dada fields:
Page Title
Meta keywords
Meta description
Few examples will be usefull
 
Thanks
vazueli

Page Title - to show in the browser top bar when that product is displayed
 
Meta Words - for search engines - separate each with a comma
 
Meta Description - might be used by search engine - is used by FaceBook, for example.
Something like ' Buy my product name here today '.
 
Hope that helps?
 
Regards
 
Chris